Channeling-machine.



11. 11. MERGER.

GHANNELING MACHINE.

APPLICATION IILED.NOV. 16, 1906. 1,01 1,221, Patented Dec.12,1911.

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H. H. MERGER.

GHANNELING MACHINE.

APPLIOATION FILED NOV. 16, 1906.

1,01 1,221. Patented Dec. 12,1911.

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H. H. MERGER.

GHANNELING MACHINE. I

APPLICATION FILED NOV. 16, 1906.

Patented Dec. '12, 1911.

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H. H. MERGER.

1 UHANNBLING MACHINE. APPLICATION fILED Nov. 16, 1906.

Patented Dec. 12, 1911.

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HENRY H. MERCER,

OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, OFCLAREMONT, NEW HAMPSHIRE, A CORPORATION OF MAINE.

CHANNELING-MACHINE.

Specification of Letters Patent.

Patented Dec. 12, 1911.

AppIication fi1ed November 16, 1906. Serial No. 343,689.

To all whom it may concern:

Be it known that I, HENRY H. MERCER, a citizen of the United States,residing in Claremont, county of Sullivan, and State of New Hampshire,have invented an Improvement in Channeling-Machines, of which thefollowing description, in connection with the accompanying drawings, isa specification. like letters on the drawings representing like parts.

My invention relates to stone-working machines, the purpose thereofbeing to increase the effectiveness of such machines.

While this invention may be applied to stoneworking machines of varioustypes and for various purposes, it is here illustrated as applied to atrack channeling machine constructed not only for cutting the usualchannel groove, but especially adapted for corner-cutting, that is, thecutting of the channel groove into the acute angle or corner underlyingthe inclined side of a quarry wall.

In the specific embodiment of the invention the corner-cutting iseffected by so mounting the tool support that, while operating as usualin the open partof the quarry it may be made to cut from a fixedposition of the machine under the overhanging side-walls while the toolswings along the arc of a circle lengthwise the channel groove,delivering its blows perpendicularly to the bottom of the groove andthereby losing none of the effectiveness of its cut-ting stroke.

My invention, having as it does other objects both connected with anddisconnected from the above-mentioned aim, will be best understood byreference to the following description, when taken in connection withthe accompanying illustration of one specific embodiment thereof, whileits scope will be more particularly pointed out in the ap pended claims.

In the drawings :Figure l is an end elevation of a channeling machineembodying one form of my invention. Fig. 2 is a section in elevation onthe line 2 2 of Fig. 1 looking in the direction of the arrow. Fig. 3 isa plan View partly in section on the line 38 in Fig. 1. Fig. 4 is acentral sectional elevation of the parts at one side of the machine.Fig. 5 is a detail showing one of the pair of tappets. Fig. 6 is anelevation partly supplied with pressure in section showing the detail ofthe tappet actuated rocker arm. Fig. 7 is a detail in plan of the upperrail clamp. Fig. 8 is a section taken through on the driving axle, andFig. 9 is a detail showing a modified form of the machine.

Referring to the drawings and to the embodiment of the invention theresubmitted for illustrative purposes, the track channeling machine thereshown is supported upon a carriage or frame work A which has journaledat opposite ends the two transverse shafts 0: provided near their outerends with pairs of flanged trucks a, the latter tracking with rails b,which are customarily laid upon the quarry bottom and along which themachine, when cutting in the usual fashion, is advanced.

The machine carries suitable tool-reciproeating motive means, which maybe of any suitable form, but which is here shown (Fig. 4) as acompressed air, direct-acting engine, fluid from a suitable source (notshown) and having the piston c, cylin der C and the cross-head guides D.The cross-head E, which is connected to the piston by the piston rod 0',has clamped thereto a suitable tool or tools, such as the gang 6 ofthree channeling tools shown part1} broken away, the cutting ends of thelatter. therefore, being given a reciprocatory cut ting movement to andfrom the bottom of the channel groove with the reciprocations of theengine piston. For adjustably feeding the tool toward the work as thechannel groove deepens, the engine cylinder and cross-head guides, whichare connected to move as a unit, are carried by the cutter head orstandard F, and may be advanced along its face by means of the fixedthreaded member a on the cylinder and engaged bv the longitudinaladjusting screw 0 which latter at its upper end is journaled in anextension f of the cutter head. 6

The cutter head (Fig. 3) is provided with suitable guiding ribs orflanges f on which the engine cylinder and the attached crosshead guidesare slidably retained by the gibs f and along which they may be adjustedlongitudinally by the adjusting screw 0 The latter at its upper end isprovi ded with a head f through which, by the attachment of a suitabletool or implement, such as the ratchet lever f (Fig. 4), the

the driving sprocket screw may be turned and the engine and cross-headadvanced toward the work as the channel groove deepens.

To obtain the swinging movement of the tool length-wise the channelgroove during corner cutting, the cutter-head F is supported at the sideof the machine upon an oscillating or swinging support G, the lattercomprising a circular plate or casting, having formed in its face (Figs.3 and l) a longitudinal depression or guide way, in which the standardis adjustably clamped by means of the clamping-plates f which are boltedto the plate G. The clampingplates hold the standard in fixed position,but the clamping-bolts may be loosened to permit it to be ad ustedlongitudinally, so that the entire standard with its attached cuttingappliances may be dropped or advanced toward the work and clamped inthis advanced position. The clampingplates preferably extend, as shown,across the entire face of the supporting-plate G, so that when thestandard is adjusted to a more advanced position it is maintained inaccurate alinement with reference to the center of the plate, the lineof reciprocatory tool action lying preferably across the oscillationaxis of the plate.

In order to provide an oscillating or swinging movement for thecutter-head and the tool lengthwise the channel groove when the machineis employed for corner cutting, the support G is mounted to swingthrough any desired arc in the main supportingframe, which of themachine, as shown in Fig. 1. To permit the oscillating movement of thecutting parts the plate G has the centrally,

formed trunmon g journaled in a bearing 72,, the latter formed in theframe H and provided with the removable lining h. The plate is held inposition by the cap 9, fastened to the trunnion by the bolt 9 andprevented from turning thereon by the pin 9 (Fig. 4

wise the channel groove, so that it may be inclined backward away fromthe vertical, to some such position, for example, as is represented inFig. 1 by dotted lines. To permit this adjustment it is provided (Figs.2 and 3) at its back and near its bottom with split brackets k by whichit may be fixedly but adjustably clamped to the shaft 72, the latterfixedly held atits ends in the carriage frame A by the cap pieces 71.The supporting frame H is held during cut-ting in either an upright oran inclined position as may be desired by any suitable means, such asthe pair of inclined brace rods I, (Figs. 2 and 3) the latter boltedeach at its upper end to a boss 1' at the back of the supporting frame Hand at its lower end latter is mounted at the side When angle cutting isdesired the main frame H 1s ad ustable about an axis length- (Fig. 8)secured to a bracket 2", adjustably bolted to a seat upon the main frameA. The threaded brace rod I passes entirely through a sleeve upon thebracket 2" and is adjustably secured thereto by checknuts i so that itslength may be adjusted to permit the necessary inclination of thesupporting frame. The back of the supporting frame is strengthened by arib 7L which connects the brackets k and the lugs i.

For reciprocating or oscillating the cutter head during corner cuttingthe circumferential edge of the oscillating plate Gr-is carried back andover the edge of the supporting plate H to form the flange 9 (Figs. 3and 4) to which is bolted the segmental gibs the latter overlying theback edge of the supporting frame H so that the plate Gr may be turnedback and forth through any angle upon the frame while held in securealinement therein.

In the illustrated embodiment of my invention the plate G is turnedthrough direct engagement of a driving member with the outer flangededge thereof, such driving member in the present instance consist-ing ofa flexible cable chain J, passing over and about the uppermost half ofthe plate perimeter. The flanged edge of the latter is approximatelygrooved and toothed as at g to receive the cable chain J, so that theplate constitutes in eflect a large sprocket wheel. Although the grooveand teeth may be extended about the oscillating plate G for its fullcircumference, since it will ordinarily be required to oscillate througha limited are only, they need usually extend over a short portion onlyof the circumference. Instead of sprocket teeth a pair of pins or thelike, such as are represented at m (Fig. 9), I

on either side of the central upper portion of the edge of theoscillating plate may be employed, such pins remaining in engagementwith the links of the cable chain for a limited range of movement. Ateach side of the plate the driving chain J passes (Figs. 1, 2 and 3)down and about a guiding sprocket wheel j, thence up and over anintervening idle sprocket wheel j to the somewhat inclined guidingsprocket wheel f, the latter j ournaled upon brackets 7' clamped to theframe at each rear corner of the machine. From the guiding sprocketwheels j the chain passes downward at the rear of the machine and to theunder side of the two toothed driving sprocket wheels jf, the lattercarried by and fixedly secured to the end of the driving axles a.Between the driving sprocket wheels there is an intermediate guidingsprocket wheel j over which the-chain passes so that the latter is heldin good contact with the underside of the driving sprocket wheels.During the swinging movement of the cutter-head the machine trucks, aswill more fully appear, are raised "inexpensive in the first instance upfrom the tracks and the chain, constituting as it does an endlessdriving member, is moved by the driving sprocket wheels j alternately inopposite directions to impart swinging movement to the plate G. The idlesprocket wheel 7" is mounted on a stud j (Fig. 3) and the latter isadjustably clamped to the frame so that it may be raised or lowered in asuitable slot 7' in the frame and the chain tightened or loosened asdesired. It will be observed that since the guiding sprocket wheels jhave their axes coincident with the axis about which the frame H isadjustably tipped for angle cutting, and since the said sprocket wheelsare of relatively small pitch diameter and with the sprocket wheelgroove on the plate G are preferably constructed so that the samestraight line is tangent to the pitch circle of both sets of sprocketwheels, the supporting plate H may be adjustably tipped backward orforward without disturbing the required alinement of the driving chainand without tightening or loosening the chain save by a comparativelysmall amount, which can readily be compensated for by adjustment of theidle sprocket wheel y" or f. Although a chain driving member is shown,it will be observed that other flexible driving members may be used, andthat driving devices other than flexible might be employed.

The described construction provides a very simple form of drive, sinceit is simple and and is capable admirably of standing rough handling inthe quarry.

Any suitable means, either manual or power driven, for givingreciprocating driving movement to the driving sprocket wheels j may beemployed, but herein I have shown a special motive device (Fig. 3)comprising the fluid pressure engine L, which is connected to turn thetransverse driving shaft Z.

The engine is connected by a flexible hose connection (not shown) to asource of compressed air supply and is controlled as to speed by asuitable throttle valve not shown. The transverse shaft Z carries at itsend the beveled pinion m, which imparts opposite but equal rotation tothe two beveled gears m and m These may be separately clutched to orunclutched from the clutch shaft m by the sliding movement of the doubleclutch member m m The movement of the latter is effected through thepair of yoke shaped arms a, embracing each a circumferential groove uponthe corresponding clutch member 772* and pinned or otherwise suitablysecured to the reversing slide rod n, which is mounted on brackets uponthe carriage frame and adapted to slide in a direction parallel with theclutch shaft m "When the rod is shifted in one direction it clutches thegear 177/ to the clutch shaft, but when shifted in the opposite dishaft.

During the cutting of the ordinary channel groove the necessarytraversing movement is given to the carriage through the clutch shaft mThe latter carries at each end a worm 0, meshing (Fig. 1) with anunderlying worm gear 0, the latter secured to the carriage shaft or axlea. Through this means which acts to drive the truck wheels of thecarriage, the latter may be moved under its own power in eitherdirection according to the position of the clutch m During cornercutting the carriage is maintained stationary and the trucks liftedclear of the track. When this occurs movement is transmitted from theengine through the clutch shaft m and the driving axles to the drivingsprocket Wheels j and thence to the driving chain J for oscillating thecutter head.

For lifting the machine off the tracks there is provided at each frontcorner of the frame a lug 7) (Fig. 1) and at each rear corner thebracket 7' threaded vertically at p to receive the jack screws: 79 thelatter having feet 72 which aline with the top of the rails and anintermediate and enlarged threaded portion 39* which passes through asplit portion 79 of the bracket or lug. After the screws are turned downto jack up the machine the split portion of the bracket is clampedtightly about the screws by means of bolts 32. The enlarged feet of thescrew are partly embraced (Figs. 1 and 3) by the upper movable member 1"of a rail clamp. The member r is fulorumed at r on the underlying clampmember r two of which are provided one at each end of the machineextending across from rail to rail and underlying the rail flange ateach end. WVheu the machine is moved along the track, these clamps aresustained by the feet of the jack screw. After the carriage is liftedfrom the track the clamps are clamped solidly to the rails 79 by thebolts 7 so as to hold the machine fixed while doing the corner cutting.Obviously other means may be employed to support the machine duringcorner cutting, and, if desired, the jack screws may rest directly uponthe quarry bottom or in holes drilled in the quarry bottom.

The transmission mechanism described causes the engine L to swing thecutter head about the supporting plate A during corner cutting with acomparatively slow swinging movement simultaneously with the rapidchopping or percussive action of the tool under the influence of thetool engine G. hen the swinging movement has advanced far enough in onedirection, the reversing rod n may be shifted and the swinging movementreversed. Such reversal may be effected by hand, but I have herein shownnot only means for manually effecting this result, but also automaticmeans as well. For this purpose the reversing rod 47. has fixed thereon(Figs. 1, 2 and 3) a sleeve 91. provided with two upwardly and forwardlyinclined ears embracing a pin 8 carried by a swinging lever arm 8. thelatter pivoted at .9 upon the bottom of the machine frame. Near itsupper end the rocker arm 8 is provided with oppositely directed lateralprojecting pins 3 and s which lie within the path of a pair of tappetst, which latter are secured to the reciprocatory slidable shipper rod25. The latter is mounted to slide in the brackets 7& at the back of thesupporting frame H. \Vhen the rod is moved in one direction one of thetappets engages with the pin 8 throwing the rocker arm in the samedirection and thereby clutching in the gear m IVhen shifted in theopposite direction the pin s is engaged by the other tappet and thisthrows the gear m into engagement, and the gear m out of engagement,with the pinion m.

Adjust-ably secured to the shipper rod 75 is a sleeve Z having anupright lug t which lies within the path of a pair of projecting rollst* which are adjustably bolted (Fig. 2) at any selected points along anare shaped slot t formed in a depending segmental portion of the cap Theface of the cap along and adjacent the slot may be graduated if desiredso that the rolls may be set to any desired angular position therein,and the movement of the cutter head automatically reversed at anyprecise angular inclination desired. By this means the tool may be maderepeatedly to swing automatically through any desired arc and to anydesired inclination.

The tappets t have each an are shaped face 25 (Fig. 5) and have a pairof inturned fingers t which engage with the surface of the shaft h sothat when the plate 72 is adjustably tipped backward the tappets stillengage with the rocker arm in any of the possible positions of the plateand the adjustment of the reversing mechanism is not thereby affected.

In order to provide a slight yield between the tappets and the clutchthe rocker arm (Fig. 6) is suitably formed to receive a stiff spring 8held between the washers 8. These washers, which are pressed against thewalls of the rocker arm abut against shoulders on the pins 8 and s andprevent their movement in either direction so that when struck by itstappet either pin transmits such blows yieldingly to the rocker arm. Tosimplify construction the necked down or reduced end of one pin isextended and in conjunction with a surrounding sleeve forms also theopposite projecting pin.

In order normally to hold the rocker arm at one side or the other of itsneutral position, the same is provided with a roll 3 against whichpresses a leaf spring 8", (Fig. 2) the roll being engaged by an invertedV- shaped portion of the spring so that the arm tends to remain wherethrown except when forcibly pushed in the opposite direction.

For the manual reversal of the swinging movement there is provided atone end of the machine (Fig. 1) the upright hand lever 'u, pivoted as atu upon the frame. Jointed to the hand lever above its pivotal attachmentto the frame is the forked end of the hand shipper rod M, the oppositeend of which is secured (Figs. 4 and 6) to the attaching collar f, thelatter fastened to the forward projecting end of the pin 8 upon therocker arm 8. In moving the hand lever in one direction or the other,therefore, the rocker arm may be thrown directly through its connectionwith the hand lever. The hand lever may be used either in substitutionfor the automatic reversing mechanism or in conjunction therewith, butit will be seen that by the described means the swinging movement of thecutter head may be reversed either automatically or by hand.

In the operation of the machine the main portion of the channel grooveis cut in the ordinary fashion with the supporting frame held eithervertically or inclined backward for angle cutting. During this operationthe driving chain J is operatively disconnected from the drivingmechanism and the plate G is preferably clamped or locked to thesupporting frame H by some suitable means, such as the locking pin '0.

A simple way of operatively disconnecting the chain from the drivingmechanism without the necessity of actually removing the same will besufficiently shown by the construct-ion in Fig. 8. The driving sprocketwheel 1' having the removable lining j is 1 mounted upon the reduced endof the axle a so as to be capable of freely turning thereon unlessotherwise prevented. During the oscillatory movement of the tool thesprocket wheel is clamped tightly against the hub of the truck a, so asto be driven with and by the axle, through means of the clamping washerj", the latter prevented from turning by the pin 9'", and adapted to beclamped against the face of the sprocket wheel by the clamping nut 7'.When the oscillation of the tool is to be stopped it is necessary merelyto loosen the nut j whereupon the axle a will turn idly within thelining of the sprocket wheel and without effect upon the chain.

When the overhanging side wall of the quarry is reached, the machine islifted free from the rails and clamped thereto, the driving chain placedin operative relation to the driving mechanism, and the tool then givenin addition to its usual reciprocatory percussive movement to and fromthe work, an oscillating movement as well through any desired angle sothat the tool travels lengthwise the channel groove in an arc like pathand its blows are delivered radially from the center of oscillation ofthe cutter head.

The adjustment of the cutter head to and from the work, which ispermitted by the clamping plates f permits the corner cutting to be doneand particularly at extreme angles with tools of much lesser length,since by this adjustment the cross-head may be brought intosubstantially the same close relation to the rock in corner cutting andangle cutting, as in upright cutting. While the guides are preferably solocated upon the supporting plate that the line of adjustment or" thecutting tool lies across the oscillation axis of the cutter-head so thatthe blows are delivered radially from the center of oscillation, thecutter-head, if desired, may be so mounted as to be displaced at oneside of the center of oscillation.

While I have shown and described one form of my invention for thepurpose of illustrating the same, it is to be understood that in detailsof construction and relative arrangement of parts, as well as in theapplication here made of the invention, the described embodiment may bewidely deviated from without departing from the spirit of the invention.

Claims.

1. A channeling machine having a reciprocatory tool, means for swingingthe tool about an axis transverse to the plane of the channel groove,and means for automatically reversing the swinging movement.

2. A channeling machine having a reciprocatory tool mounted to swinglengthwise the channel groove, means for swinging the same and means foradjustably fixing the limit of swinging movement.

3. A channeling machine having a reciprocatory tool mounted toreciprocatively swing lengthwise the channel groove and means forautomatically limiting the angle of the swinging movement.

4:. A channeling machine having a reciprocatory tool mounted forswinging movement lengthwise the channel groove and means eithermanually or automatically to control the swinging movement.

5. A channeling machine having a channeling tool, means for swinging thesame about an axis transverse the channel groove and means automaticallyto reverse the swinging movement when a given limit of swing has beenreached.

6. A channeling machine having a tool, a traveling support upon whichsaid tool is mounted, means to move the same lengthwise the channelgroove, driving means for swinging the tool about the support lengthwisethe channel groove, and means for automatically reversing the swingingmovement.

7 A channeling machine having a cutter head mounted for swingingmovement about an axis transverse the channel groove, cutting meansthereon, power actuated means for imparting movement to the cuttingmeans, power actuated means for swinging the cutter head during cuttingmovement and means automatically to reverse the swinging movement.

A channeling machine having a cutter head mounted for swinging movementlengthwise the channel groove, power actuated means for swinging thecutter head during cutting movement and means for adjustably fixing theangle of the swing.

9. A channeling machine having a pivoted tool support, driving means forswinging the tool support about its pivot, reversing means for reversingthe movement of said driving member, actuating means for said reversingmeans and means carried by said swinging tool support for acting uponsaid actuator means alternately in the opp0- site direction.

10. A channeling machine having a pivoted tool support, driving meansfor swinging the same, reversing means for reversing the drivingmovement, actuating means for actuating said reversing means, and meanscarried by said tool support and adjustable relatively to said actuatingmeans for engaging the latter and effecting reversal of said drivingmeans.

11. A channeling machine having a pivoted tool support,

driving means for swinging said support, a reversing member forreversing the driving movement, a pivoted arm connected to move saidreversing memher, a sliding shipper rod mounted to engage with said armin either direction of its movement and adjustable means carried by saidtool support for moving said rod and acting thereby automatically toreverse the swinging movement of the support.

12. In a channeling machine the combination with a swinging tool supportof means for swinging said support and means for reversing swingingmovement comprising an actuating lug and a pair of members adapted onswinging movement of the tool to en gage the said lug alternately inopposite directions, and means permitting relative adjustment of saidlug and said members whereby the angle of swinging movement may beadjusted.

13. A channeling machine having a tool support mounted for tippingadjustment about an axis lengthwise the cutting plane, means forswinging said support lengthwise the cutting plane and about an axistransverse thereto and means automatically to reverse the swingingmovement.

14. A channeling machine having a swinging tool support an endless chainfor swinging said support and means for imparting movement to the chainfor swinging the support.

15. A channeling swinging tool support an endless flexible drivingmember for swinging said support and means for imparting movement to thedriving member for swinging said support.

16. A channeling machine having a swinging tool support adapted fortipping adjustment about an axis lengthwise the cutting plane, a rotaryguiding member a flexible driving member connected to swing said supportand passing about a rotary guiding member mounted upon the tipping axisof said support and means for imparting movement to the flexible drivingmember.

17. A channeling machine having a swinging tool support mounted fortipping adjustment about an axis lengthwise the channel groove, aflexible driving member for said support means for imparting movement tothe said driving member and guiding members for said driving membermounted upon the tipping axis of the support.

18. A channeling machine swinging tool support, a sprocket wheelconnected therewith, a flexible driving member passing over the sprocketwheel, and a driving sprocket wheel to swing said support through saiddriving member.

19. A channeling machine having a swinging tool support, a sprocketwheel connected therewith, and endless chain passing over said sprocketWheel, a guiding sprocket wheel at the side of said tool support and oneor more driving sprocket wheels also engaged with said chain. 7

20. A channeling machine having a swinging tool support mounted fortipping adjustment about an axis lengthwise the channel groove, anendless flexible driving member connected to swing said support meansfor imparting movement to the said driving member and guiding membersmounted upon the tipping axis.

21. A channeling machine having a swinging tool support, a flexibledriving machine having a member connected to swing said support, a-

carriage, means for progresslvely moving said carriage and means drivenby said carriage driving means for moving the flexible driving member.

22. A channeling machine having a carriage, a driving axle, a swingingtool support, a flexible driving member connected to swing said toolsupport, and a driving member upon said carriage axle adapted to engagewith said flexible driving member.

23. A channeling machine having a carriage, a swinging tool support atthe side thereof, means for adjustably tipping said having a 1 supportabout. an axis lengthwise the channeling groove, guiding members at theside of said tool support, a driving axle, a drive ing member upon saidaxle, and an endless flexible driving member engaging with said drivingmember, said guiding members and said tool support for efl'ectingswinging movement of the latter.

24. A channeling machine having a tool support, a flexible swinging thetool, means for adjusting said tool support for angle cutting and meansfor taking in or letting out slack in said flexible driving member toadapt it to a changed position of the support.

25. A channeling machine having a swinging tool support, a drivingshaft, a flexible driving member operatively connecting said shaft tosaid support and means for disconnecting said driving member from saidshaft.

26. A channeling machine having a swinging tool support, a carriage, adriving axle, a sprocket wheel on said axle, a driving chain passingover said sprocket wheel and connected to swing said tool support andmeans for disconnecting said sprocket wheel from said axle.

27. A channeling machine having a swinging tool support, means swingingmovement thereof, automatic actuating means therefor, and yieldableconnection between said actuating means and reversible means. I

28. A channeling machine having a pivoted tool-support, a truck, meansfor driving the truck, tool-swinging means con nected to the truckdriving means, and means for disconnecting the tool-swinging means atwill.

29. A channeling machine having a truck, a pivoted tool support, atruckdriving shaft, driving connections between the same and the toolsupport, and means for disconnecting the shaft from the tool support.

30. A channeling machine having a swingingtool support, a truck, adriving axle for the truck, and connections between the driving axle andthe support for imparting swinging movement to the latter. 31. Achanneling machine having a truck, a swinging tool support, truckdriving means and means connecting said truck driving means with saidsupport for imparting swinging movement to the latter, said meansincluding a flexible driving member and means for operativelydisconnecting said flexible member from said truck driving means, whilestill leaving the same in position upon the machine.

32. In a channeling machine, the combination. with a percussivechanneling tool provided with a cutting end, of a support upon which thesame is pivotally. mounted for swinging movement, means'to hold the,

driving member for for reversing the support rigidly fixed upon thequarry bottom adjacent an overhanging side wall of the quarry and withthe tool positioned to swing reciprocatively through a plane transverseto the quarry bot-tom from an upright position to a forwardly inclinedposition beneath said wall, power-driven means for swinging the toolabout its pivotal support to extend the channel in the quarry bottombeneath the overhanging side wall, and means for automatically reversingthe swinging movement of the tool.

33. A channeling machine adapted to be moved progressively for cuttingan ordinary channel groove, means for holding the channeling tool fixedduring such progressive cutting movement, means for holding the machinefixed, means for swinging the tool when the machine is so held, andmeans for a Copies of this patent may be obtained for five cents each,by addressing the automatically reversing the swinging movement of thetool.

34. A channeling machine having a wheeled truck, a driving motorthereon, means for holding the tool fixed while the truck is advancedfor progressively cutting the ordinary channel groove, means forconnecting the truck driving motor to swing the tool, means for holdingthe truck fixed during such swinging movement of the tool, and means forautomatically reversing the swinging movement thereof.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

HENRY H. MERGER.

Witnesses:

JAMES R. BRUCE, ELMER G. GLIDDEN.

Commissioner of Patents,

Washington, D. G.

